EXPERIMENTAL VALIDATION OF MONTE-CARLO DOSE CALCULATIONS ABOUT A HIGH-INTENSITY IR-192 SOURCE FOR PULSED DOSE-RATE BRACHYTHERAPY

被引:70
作者
VALICENTI, RK
KIROV, AS
MEIGOONI, AS
MISHRA, V
DAS, RK
WILLIAMSON, JF
机构
[1] Radiation Oncology Center, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri
关键词
IR-192; PULSED DOSE RATE; THERMOLUMINESCENT DOSIMETRY; MONTE CARLO;
D O I
10.1118/1.597484
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Despite widespread use of high-intensity lr-192 remotely afterloaded sources, no published measured or calculated dose-rate tables for currently used source designs are available. For a pulsed dose-rate lr-192 source, both transverse axis (0.5-10 cm) and two-dimensional polar dose-rate profiles (1.5, 3, and 5 cm) were measured with thermoluminescent dosimetry in a solid water phantom. Dose rates were normalized to measured air-kerma strength, and the source geometry was verified by pinhole autoradiography and transmission radiography. At each measurement point, dose rates were calculated by a Monte Carlo photon transport (MCPT) code, which realistically modeled the experimental phantom, source, and detector geometry. Agreement between MCPT absolute dose-rate calculations and measurements averaged 3% and was less than 5%, demonstrating that Monte Carlo simulation is an accurate and powerful tool for two-dimensional dosimetric characterization of high activity lr-192 sources. © 1995, American Association of Physicists in Medicine. All rights reserved.
引用
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页码:821 / 829
页数:9
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